<li class="el-menu-item-group">
    <div class="el-menu-item-group__title" [style]="paddingStyle()" #groupTitle
        (mouseenter)="groupTitle.style.backgroundColor = rootMenu.hoverBackgroundColor() "
        (mouseleave)="groupTitle.style.backgroundColor = ''">
        <ng-container *ngIf="!titleTmp"> {{title}} </ng-container>
        <ng-container *ngIf="titleTmp">
            <ng-template [ngTemplateOutlet]="titleTmp"></ng-template>
        </ng-container>
    </div>
    <ul>
        <ng-content></ng-content>
    </ul>
</li>